Focusing finder for cameras



W. H. SAECK. FOCUSING FINDER FOR CAMERAS. APVPLlcArloN jHLED JUNE 2,'1921.

1,430,684. Patented 001:. 3, 1922,.

jf" la Iffllllw Patented Oct. 3, 1922.

PATENT oFt-lc WILLIAM H. SAECK, OF MADISON, WISCONSN.

FOGUSING FINDER FOB CAMERAS.

Application med :une 2, 1921./ serial Ng. 474,425.

To all lwhom t may concem e With the usual plate camera it is necessary in order to determine the proper focal' adjustment, to remove the plate holder and use a hood to determine the proper adjustv `ment by viewing the image on the screen.

This method is particularly objectionable in connection with vfilm cameras owing to the impracticability of removing the lm. For this reason extensible lm cameras are usually provided withv a gauge for indicating'- the proper adjustment for a given distance from the object to'be photographed hence it is necessary to accurately judge the distance or to measure it in vorder to determine the proper adjustment to be made.

It is an object of my invention to provide a device which may be attached to--a-ny of the commercial types of cameras and by means of which the proper adjustment may be directly determined without removing the plate or ilm or otherwise interfering with the normal functionof the camera.

It is a further object to provide an attachment including a small auxiliary ,lens Aof the same focal length as the camera'lens and a screen on which a miniatureimage may be visualized in order to determine 'when the adjustment has been properly made.

` It is a further object of the invention ,to provide a device which may be properly adjusted so as'to adapt it for any size of camera.

With the above general objects in view, my invention comprises certain structural details which will be described in connection with the accompan in drawing, in which- Figure 1 is a si e e evation of my invention attached to a camera. of the film type, a

y vportion of' the screen frame being broken n Beit known that I, WILLIAM H. Serien,

a citizen of the United States, and resident.

away, and

Figure 2 is a plan view of the same.

l Referring more specifically to the drawing, numeral 1 indicates the outside casing of the camera which is provided with the usual lens and shutter 2 which is carried by a lens frame 3 slidably mounted in the guideway 4; which is pivotally connected to the camera casing. The usual bellows 5 extends from the lens to the casing. My attachment comprises a miniature lens 6similar in shape to the camera lens and carried by an arm 7 which is attached to the lens frame 3 by means of a set screw, or the like, 8. The lens 6 is connected by the bellows 17 with the'screen frame 9, in which is mounted a reiiector or mirror 10 in an inclined posi' tion so as to reiect upwardly the' rays coming from the lens., At the upper side of the frame 9,'is a horizontally disposedscreen 11. The frame 9 is provided with a flange l2 which is adjustably attached by means of the screw and slot 13 to the bracket '14.

-may be longitudinally adjusted by means of the screw and slot 13 so that the image viewed on the screen 11 will be of the same characterr as the'image projected upon the l camera plate. -The operator may then view upon the screen 11 t e image of the object to be photographed and may determine ac curately when he has secured the proper focal adjustment. It will also be seen that my invention may be quickly attached to any of the commercial types of cameras, and

will` obviate any lguess work as to the range I or any inconvenience of removing the plate holder or film.

I claim -as my invention: e

An attachment for cameras comprising a diminutive lens, a frame in which the lens is mounted, means for attaching the frame to the shutter frame of camera with said lens`-in the same plane as the camera lens, a bracket adapted' to lbe secured to the camera casing, a' screen Vframe having a screen mounted in one side thereof, means for attaching the screen frame to said bracket with the screen in horizontal position, a correspond with the distance between the bellows connecting the lens frame and screen lens and photographic element of the camera. frame, a reflector for reflecting upon the In testimony that I claim the foregoing I 10 screen, rays which pass through the lens, have hereunto set my hand at Madlson, in

5 and Ineens for adjusting the screen frame the county of Dane and State of Wisconsin.

longitudinally on seid bracket so that the distance between the lens and screen Will WILLIAM H. SAECK. 

